Programmable temperature transmitters
October 2004
Temperature Measurement
Programmable transmitters have many advantages such as digital design, catering to any temperature range and ability to re-program sensors to suit every application. However, these benefits usually come with a high price. As a result, Novus has recently launched a new range of temperature transmitters that offer all the benefits of programmable transmitters for the price of non-programmable (analog) versions.
Analog temperature transmitters are based on an analog design and can only handle one temperature range and one sensor (eg, a pt100 with a temperature range of 100°C). They are subject to drift and the potentiometer slides out of calibration due to vibration. It is difficult to keep stock for so many different applications and delivery times are therefore a problem.
Programmable temperature transmitters are based on a digital design and are therefore not subject to drift. They can handle all temperature ranges, any sensor and can be re-programmed via a PC to suit every new application (eg, a pt100 with a temperature range of 100°C or a thermocouple with a temperature range of 200°C). Stock of different transmitters is not required and availability is not a problem.
Novus's new range of programmable temperature transmitters bridges the gap between programmable and analog versions. They are priced to compete with analog transmitters but are claimed to be a fraction of the cost of normal programmable transmitters.
The TxBlock and TxRail comprise a family of head mount and DIN rail mount transmitters for the most common temperature applications. One single model can be configured to accept all thermocouple types and Pt100 RTDs. The transmitters are available with a 0 to 10 V output or a 4 to 20 mA output. They can be powered by an external power supply of between 18 and 30 V and can be loop powered. There is also an isolated (Txirail) version that is isolated between the sensor and the transmitted current/voltage.
All units are easily configurable via PC. The output of the transmitter is scalable to different input ranges. Input type, working range and output calibration can be achieved by means of a cable and an RS232 port from a PC. Novus transmitters are exclusively distributed in South Africa by UniTemp.
For more information contact Marcel Kelly, UniTemp, 011 392 5989, [email protected], www.unitemp.co.za
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